#### Wapda Junior Engineer Test PTS 2018

The Pakistan Water & Power Development Authority is a government-owned public utility maintaining power and water in Pakistan, although it does not manage thermal power. WAPDA includes Tarbela and Mangla dams among its resources. Its headquarters are in Lahore.

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**01 . ** Dielectric strength In case of mica can be expected to be more than**(500kv/mm)**

** 02 .** All of the following dielectric material are preferred for high frequency application except **(Butyl rubber) **

**03 . ** Polar dielectric are normally used for **(Dc and power frequencies)**

**04 .** Which of the following are polar dielectric **(Nylon)**

**05 . ** The impurity in liquid dielectric which has significant effect in reducing the breakdown

strength, is**(Moisture)**

**06 .** A good dielectric should have all the following properties except**(High dielectric loss)**

**07 .** The variety of paper used for insulation purpose is**(Craft paper)**

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**08 .** Corona effect can be identified by**(Faint violet glow) **

**09.** In van de graaff generator output voltage is controlled by**(Controlling the corona source voltage) **

**10 . ** A tesla coil is**(High frequency resonant transformer) **

**11 .** Insulators for high voltage applications are tested for**(Both power frequency and impulse test) **

**12 . ** Transformer contribute to radio interference due to**(Corona discharge, internal or partial discharge, sparking, all)**

**13 . ** The electrical breakdown strength of insulating material depend on**(Nature of applied voltage, imperfection, pressure temp humidity, all)**

**14 . **Vacuum insulation is used in all of the following except**(EHT of color TV) **

**15 . ** Liquid are generally used as insulating material up to voltage stresses of about**(50kv/cm)**

**16 .** When one of three series resistors is removed from a circuit and the circuit is

reconnected, the current**(Increase) **

**17 . ** The number 3.2 * 10^-5 A expressed using a metric prefix is**(32uA) **

**18 . ** A resistor is connected across a 50V source. What is the current in the resistor if the color

code is red, orange, orange, silver**(2.2mA)**

**19 . ** Approximately how many mill amperes of current flow through a circuit with a 40V

source an d6.8Kohm of resistance**(5.9mA) **

**20 . ** When a forth resistor is connected in series with three resistors, the total resistance**(increases) **

**21 . ** A string of five series resistor is connected across a 6 V battery. Zero voltage is measured

across all resistors except R3. The voltage across R3 is**(6V)**

**22 . ** A certain series circuit consists of a 1/8W, 1/4W, and 1/2W resistors. The total resistance

is 1200 ohm. If each resistor is operating in the circuit at its maximum power dissipation,

total current flow is**(27mA)**

**23 .** The total power in a certain circuit is 12 W. Each of the four equal-value series resistors

making up the circuit dissipates**(3W)**

**24 .** All the voltage drops and the source voltage added together in a series circuit is equal to**(zero)**

**25 . ** If a 24 V and a 6 V battery are series opposing, the total voltage is**(18V)**

**26 . ** The output of a certain voltage divider is 12 V with no load. When a load is connected,

the output voltage**(Decrease) **

**27 . ** The parallel combination of a 470 resistor and a 1.5 k resistor is in series with the

parallel combination of five 1 k resistors. The source voltage is 50 V. The percentage

of the load current through any single 1 k resistor is**(20 %) **

**28 .** A 20 kHz pulse waveform consists of pulses that are 15 s wide. The duty cycle**(30%)**

**29 .** A 5 mH, a 4.3 mH, and a 0.6 mH inductor are connected in parallel. The total inductance

is**(Less than 0.6mH) **

**30 .** the winding resistance of a coil can be increased by**(Increasing the number of turns or using thinner wire) (Inductor)**

**31. ** When the current through an inductor is cut in half, the amount of energy stored in the electromagnetic field** (Is quartered) **

**32. ** In a series RC circuit, 12 V (rms) is measured across the resistor and 15 V (rms) is measured across the capacitor. The rms source voltage is **(19.2) **

** 33. ** When the frequency of the source voltage decreases, the impedance of a parallel RC circuit **(Increase) **

**34. ** An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist ** (R[XC]**

**35 .** In a certain series resonant circuit, VC = 125 V, VL = 125 V, and VR = 40 V. The value of

the source voltage is**(40 V) **

**36 .** In applying the superposition **theorem,**

(The sources are considered one at a time with all others replaced by their internal

impedance) (Circuit theorem and ac analysis)

**37 .** In order to get maximum power transfer from a capacitive source, the load must

(**Have impedance that is the complex conjugate of the source impedance)**

**38 . ** A two-terminal variable resistor is known as a**(Rheostat) **

**39 .** A half-watt is equal to how many mill watts?**(500mW) **

**40 . ** Three hundred joules of energy are consumed in 15 s. The power is**(20W)**

**41 . ** How much continuous current can be drawn from a 60 Ah battery for 14 h?**(4.28A) **

**42 . ** A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation

of the resistor is**(132mW) **

**43 . ** When the speed at which a conductor is moved through a magnetic field is increased, the

induced voltage**(Increase)**

**44 .** The induced voltage across a coil with 250 turns that is located in a magnetic field that is

changing at a rate of 8 Wb/s is**(2000v) **

**45 .** For a given wire wound core, an increase in current through the coil

(**Increases the flux density**)

**46 .** If the cross-sectional area of a magnetic field increases, but the flux remains the same, the

flux density **(Decreases**)

**47 . ** When the current through the coil of an electromagnet reverses, the

(**Direction of the magnetic field reverses) **

**48 .** The unit for reluctance is**(At/Wb)**

**49 . ** A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is

decreased, the voltage induced across the coil will**(Decrease) **

**50 . ** What kVA rating is required for a transformer that must handle a maximum load current

of 8 A with a secondary voltage of 2 kV?(16 kVA)** (16 kVA) (Transformer)**

**51 . ** A certain transformer has 400 turns in the primary winding and 2,000 turns in the

secondary winding. The turns ratio is**(5) (Transformer)**

**52 .** The primary winding of a transformer has 110 V ac across it. What is the secondary

voltage if the turn’s ratio is 8?**(880) (transformer)**

**53 .** The primary winding of a transformer has 110 V ac across it. What is the secondary

voltage if the turn’s ratio is 8?**(880) (transformer)**

**54 .** In a certain loaded transformer, the secondary voltage is one-fourth the primary voltage.

The secondary current is**(4 times) (Transformer)**

**55 . ** The primary winding of a power transformer should always be**(Fused) (Transformer)**

**56 . ** In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the

winding resistance, what is the output power to the load, neglecting any other issues?**(111.5 W) (transformer)**

**57 .** The maximum output voltage of a certain low-pass filter is 15 V. The output voltage at

the critical frequency is** (10.60v) (passive filter)**

**58 . ** When both inputs of NAND gate is high, output will be**(Low)**

**59 .** The angular velocity of geostationary satellite is**(Equal to angular velocity of earth)**

**60 .** A diode can be used as a frequency multiplier because of its**(Non linearity) (Blog)**

**61 . ** Which of the following is not characteristic of an oscillator?**(Negative feedback) (Blog)**

**62 .** The other name for beta of BJT is**(Current amplification factor) (Blog)**

**63 . ** When the bias in an FET stops the flow of current, the condition is called**(Pinch off) (Blog)**

**64 . ** In N-type semiconductor, the minority carriers are**(Holes) (Blog)**

**65 . ** A power gain of 30dB is equivalent to which amplification factor?**(1000) (blog)**

**66 . ** UJT when used for triggering as SCR, has waveform**(Saw tooth)**

**67 .** The RMS value of load phase voltage is**(141.4v) (electrical objective question with answer)**

**68 . ** If the dc bus voltage Vd = 300v, the power consumed by 3 phase load is** (3kW) (electricalobjective question with answer)**

**69 . ** A resistance of 50 k ohm has a conductance of (0.02mS)**( electrical objective questionwith answer, BEE)**

**70 .** Which of the following is incorrect (1J=1N/m)** (electrical objective question with answer)**

**71 . ** Electromotive force is provided by (an electric current)**( electrical objective question withanswer)**

**72 .** In order that work may be done (a supply of energy is required)**( electrical objectivequestion with answer)**

**73 . ** Unit of resistivity is**(Ohm-m) (Electrical objective question with answer)**

**74 . ** Input impedance of op-amp is**(Low)**

**75 . ** Output impedance of inverting op-amp is**(Infinite)**

**76 . ** In case of short circuit, current is**(Infinite)**

**77 . ** Bulb in streets are connected in**(Parallel) (electrical4u)(Electric circuit)**

**78 . ** A 240V, 60W lamp has a working resistance of**(960 ohm) (Electrical objective question with answer)**

**79 . ** R=10, I=2, P=**(40W)**

**80 . ** Conductance is the reciprocal of**(Resistance)**

**81 . ** The motor use in ceiling fan is**(Capacitor)**

**82 .** In brief, the higher voltage spike on ac power line is called**(Arc)**

**83 . ** Voltage drop is (Potential difference between two points)

**84 . ** Three basic quantities of electrical are **(V, I, R)**

**85 . ** Pitras shah Bukhara was**(Urdu poet)**

**86 . ** Man and superman was written by**(Bernard shah)**

**87 . ** Doab refer to land between**(Two rivers)**

**88 . ** Waive synonym is**(Not insist, pardon)**

**89 .** They felt humiliated because they**(had cheated)**

**90 . **Cataract means**(Waterfall)**